X-42 Pop-Up Upper Stage
Encyclopedia
X-42 is the designation of a still-classified U.S. military space project. Specifications or photos of the program have not been released to the public; as a result not much is known about its goals. It is believed to be a liquid fueled rocket upper stage capable of boosting a payload of up to 4,000 lb (1,800 kg) into Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...

 orbit.

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Related development:

Comparable aircraft:

Designation Series:
X-39
Future Aircraft Technology Enhancements
The Future Aircraft Technology Enhancements program is a program to develop new technologies. It is being run by the Air Force Research Laboratory and the Defense Advanced Research Projects Agency . The X-39 aircraft designation is reserved for use with FATE by the USAF.-References:***...

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X-40
Boeing X-40
-See also:-External links:* * * * *...

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X-41
X-41 Common Aero Vehicle
X-41 is the designation for a still-classified U.S. military spaceplane. Specifications or photos of the program have not been released to the public yet; as a result not much is known about its goals...

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X-42 -
X-43 -
X-44
X-44 MANTA
|-References:* Miller, Jay. The X-Planes: X-1 to X-45. Hinckley, UK: Midland, 2001. ISBN 1-85780-109-1.-External links:* Day, Dwayne A. . centennialofflight.gov...

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X-45
Boeing X-45
The Boeing X-45 unmanned combat air vehicle is a concept demonstrator for a next generation of completely autonomous military aircraft, developed by Boeing's Phantom Works. Manufactured by Boeing Integrated Defense Systems, the X-45 was a part of DARPA's J-UCAS project.-Development:Boeing developed...

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